CVE-2022-20623

What it is

A vulnerability in the rate limiter for Bidirectional Forwarding Detection (BFD) traffic of Cisco NX-OS Software for Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to cause BFD traffic to be dropped on an affected device. This vulnerability is due to a logic error in the BFD rate limiter functionality. An attacker could exploit this vulnerability by sending a crafted stream of traffic through the device. A successful exploit could allow the attacker to cause BFD traffic to be dropped, resulting in BFD session flaps. BFD session flaps can cause route instability and dropped traffic, resulting in a denial of service (DoS) condition. This vulnerability applies to both IPv4 and IPv6 traffic.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

11.9% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2022-02-23 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 04:24 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 11.9% in the next 30 days (EPSS).
• Severity: 8.6 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2022-02-23 18:15 UTC

Last modified

2026-06-17 04:24 UTC

Exploit probability

11.9% · EPSS, next 30 days

Weakness

CWE-399

Record status

Undergoing Analysis

Affected

• Cisco nx-os ≤ 7.0\(3\)i7\(3\)
• Cisco nx-os ≤ 9.3\(8\)
• Cisco nx-os ≤ 10.2\(1\)

Attack profile CVSS 3.1 · 8.6

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2022-20623.md and follow it. Check whether this project is affected by CVE-2022-20623. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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